I wish LibreOffice, GIMP etc. had an M-x way of finding the commands, and a describe-function to ask what exactly a given command is doing. Or C-h b way of sifting through keyboard shortcuts, in just another buffer with search and everything.
Libreoffice has a feature request for such a function [1].
[1]: https://bugs.documentfoundation.org/show_bug.cgi?id=91874